package com.guestbook.filters;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class AuthenicationFilter implements Filter {
	private String url="/";
	public void destroy() {

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req=(HttpServletRequest)request;
		HttpServletResponse res=(HttpServletResponse)response;
		HttpSession session=req.getSession();
		if(session.getAttribute("guestbook.admin.username")==null){
			res.sendRedirect(req.getContextPath()+url);
		}
		chain.doFilter(request, response);
	}

	public void init(FilterConfig config) throws ServletException {
		url=config.getInitParameter("url");
	}

}




